feat: M3 — 伏笔账本 + 节奏引擎 + 大纲（含并发记账 bugfix）

- 伏笔账本：纯函数状态机(OPEN/PARTIAL/CLOSED/OVERDUE) + ForeshadowLedger repo；验收后到期扫描(BackgroundTask 自建 session 置 OVERDUE)；登记/状态变更端点
- 节奏 + 三审齐：foreshadow-analyst + pace-checker 并入 LangGraph 并行审(REVIEW_SPECS)，collect 分列落 chapter_reviews(conflicts/foreshadow_sug/pace)，review SSE 加 foreshadow/pace 事件
- 大纲：outliner Agent 产 OutlineResult(含 foreshadow_windows)，POST /outline 逐章 upsert outline 表；GET /foreshadow?status= 看板
- 前端：伏笔四泳道看板(OVERDUE 琥珀) + 大纲编辑器(窗口徽标) + 节奏节拍图(▁▃▅) + 审稿页消费 foreshadow/pace SSE
- bugfix(T3.8)：并行三审共用请求 session 记账触发 'Session is already flushing' → foreshadow/pace 静默丢失；SqlAlchemyLedgerSink.record 改 add-only(靠端点/事务 commit)，加并发回归测试
- M3 E2E：真实 DB + mock 网关零 token 走通 埋设→进展→验收后扫描 OVERDUE→看板 + 大纲含窗口 + 三审齐 SSE/留痕；E2E 暴露并钉住上述 bug
- 门禁绿：mypy 111 / pytest 228(0 xfailed) / alembic 无漂移；前端 gen:api/lint/tsc/vitest 69/build

apps/web/lib/review/history.ts

@@ -2,17 +2,32 @@
 // 纯逻辑（可单测）；schema 把 conflicts 标成 {[k]:unknown}[]，这里安全收窄。
 
 import type { ReviewHistoryItem } from "@/lib/api/types";
-import type { ReviewConflict } from "./sse";
+import type {
+  ForeshadowKind,
+  ForeshadowSuggestion,
+  PaceIssue,
+  PaceReport,
+  ReviewConflict,
+} from "./sse";
 
 function asString(v: unknown, fallback = ""): string {
   return typeof v === "string" ? v : fallback;
 }
 
+function asOptionalString(v: unknown): string | null {
+  return typeof v === "string" ? v : null;
+}
+
 function asStringArray(v: unknown): string[] {
   if (!Array.isArray(v)) return [];
   return v.filter((x): x is string => typeof x === "string");
 }
 
+function asIntArray(v: unknown): number[] {
+  if (!Array.isArray(v)) return [];
+  return v.filter((x): x is number => typeof x === "number" && Number.isFinite(x));
+}
+
 // 把一条留痕的 conflicts 收紧（缺字段给安全默认；保持顺序=下标身份，对齐冲突 gate）。
 export function normalizeConflicts(
   item: ReviewHistoryItem | undefined,
@@ -26,6 +41,46 @@ export function normalizeConflicts(
   }));
 }
 
+// 把一条留痕的 foreshadow_sug（扁平 list，每条带 kind）收紧成建议（缺字段给安全默认）。
+// 对齐 collect 列映射（C4 扩 T3.3）：planted/resolved 扁平成单 list、每条加 kind。
+export function normalizeForeshadowSug(
+  item: ReviewHistoryItem | undefined,
+): ForeshadowSuggestion[] {
+  const raw = item?.foreshadow_sug ?? [];
+  return raw.map((s) => ({
+    kind: asKind(s["kind"]),
+    code: asOptionalString(s["code"]),
+    title: asString(s["title"], "（未命名线索）"),
+    where: asOptionalString(s["where"]),
+    note: asOptionalString(s["note"]),
+  }));
+}
+
+function asKind(v: unknown): ForeshadowKind {
+  return v === "resolved" ? "resolved" : "planted";
+}
+
+// 把一条留痕的 pace（dict）收紧成节奏报告；缺失/非 dict → null（不渲染节拍图）。
+export function normalizePace(
+  item: ReviewHistoryItem | undefined,
+): PaceReport | null {
+  const raw = item?.pace;
+  if (typeof raw !== "object" || raw === null) return null;
+  const dict = raw as Record<string, unknown>;
+  const waterRaw = Array.isArray(dict["water"]) ? dict["water"] : [];
+  const water: PaceIssue[] = waterRaw
+    .filter((w): w is Record<string, unknown> => typeof w === "object" && w !== null)
+    .map((w) => ({
+      where: asString(w["where"]),
+      reason: asString(w["reason"]),
+    }));
+  return {
+    water,
+    hook: dict["hook"] === true,
+    beat_map: asIntArray(dict["beat_map"]),
+  };
+}
+
 // 最近一条留痕（GET .../reviews 已按新→旧排序）。
 export function latestReview(
   items: readonly ReviewHistoryItem[] | undefined,